Altitude Above the Height of the Ocean

This page is the CodyCross answer for the clue below from Top Secret, Group 2083, Puzzle 1 (Field Operative).

Question is: Altitude Above the Height of the Ocean

and the answer is: SEALEVEL

Word Meaning:

SEA LEVEL — The nominal height of the surface of the oceans above which heights of geographical features and aircraft flight levels are measured.

Definitions from Wiktionary.

Altitude Above The Height Of The Ocean - Top Secret CodyCross Answers | CodyCross Solutions